Hair straightening brush



FIG. 1 is a perspective view of a design for a hair straightening brush;

FIG. 2 is a bottom plan view of the hair straightening brush shown in FIG. 1;

FIG. 3 is a top plan view of the hair straightening brush shown in FIG. 1;

FIG. 4 is a right side elevation view of the hair straightening brush shown in FIG. 1; the left side elevation view being a mirror image;

FIG. 5 is a front elevation view of the hair straightening brush shown in FIG. 1; and,

FIG. 6 is a rear elevation view of the hair straightening brush shown in FIG. 1.

The features shown in broken lines do not form part of the claimed design. 

CLAIM The ornamental design for a hair straightening brush, as shown and described. 